/*      $OpenBSD: ffs.S,v 1.1 2020/06/10 20:19:29 naddy Exp $ */
/*
 * Written by Christian Weisgerber <naddy@openbsd.org>.
 * Public domain.
 */
 
#include <machine/asm.h>

ENTRY(ffs)
        RETGUARD_SETUP(ffs, x15)
        rbit    w1, w0
        clz     w1, w1
        cmp     w0, wzr
        csinc   w0, wzr, w1, eq
        RETGUARD_CHECK(ffs, x15)
        ret
END(ffs)